Security analysis of stochastic networked control systems under false data injection attacks

In this paper, the security issue is investigated for networked control systems (NCSs) where the physical plant is controlled by a remote observer-based controller. The communication channel from system measurement to remote control centre is vulnerable to attacks from malicious adversaries. Here, false data injection (FDI) attacks are considered. The aim is to find the so-called insecurity conditions under which the NCS is insecure in the sense that there exist FDI attacks that can bypass the anomaly detector but still destabilize the overall system. In particular, a new necessary and sufficient condition for the insecurity is derived when the communication channel is compromised by the adversary. Moreover, a specific algorithm is proposed with which the NCS is shown to be insecure. A simulation example is utilized to demonstrate the usefulness of the proposed conditions/algorithms in the secure control problem.